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LP8866S-Q1 Datasheet(PDF) 59 Page - Texas Instruments |
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LP8866S-Q1 Datasheet(HTML) 59 Page - Texas Instruments |
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59 / 82 page  mV SENSE BOOST _ OCP 200 R I (22) where • RSENSE: boost sense resistor (mΩ) • IBOOST_OCP: boost overcurrent limit 8.2.1.2.9 Power-Line FET A power line FET can be used to disconnect input power from boost input to protect the LP8866S-Q1 device and boost components in case an overcurrent event occurs. A P type MOSFET is used for the power-line FET. Voltage rating must be at least 25% higher than maximum input voltage level. Low RDSON is important to reduce power loss on the FET — less than 20 mΩ is recommended. Current rating for the FET must be at least 25% higher than input peak current. Minimum Gate-to-Source voltage (VGS) to turn on transistor fully must be less than minimum input voltage; use a 20-kΩ resistor between the pFET gate and source. 8.2.1.2.10 Input Current Sense Resistor A high-power resistor can be used for sensing the boost input current. Overcurrent condition is detected when the voltage across RISENSE reaches 220 mV. Typical 20-mΩ sense resistor is used to set 11-A input current limit. Sense resistor value can be increased to lower overcurrent limit for application as needed. Power rating can be calculated from the input current and resistance value. 8.2.1.2.11 Feedback Resistor Divider Feedback resistors RFB1 and RFB2 determine the maximum boost output level. Output voltage can be calculated as in Equation 23: BG OUT_ MAX SEL_MAX FB1 BG FB2 V V = + I R + V R · § u ¸ ¨ © ¹ (23) where • VBG = 1.21 V • ISEL_MAX = 38.7 µA • RFB1 / RFB2 normal recommended range is 7~15 8.2.1.2.12 Critical Components for Design Figure 8-2 shows the critical part of circuitry: boost components, the LP8866S-Q1 internal charge pump for gate- driver powering, and powering/grounding of LP8866S-Q1 . Schematic example is shown in Figure 8-2. www.ti.com LP8866S-Q1 SNVSBD1A – AUGUST 2020 – REVISED FEBRUARY 2021 Copyright © 2021 Texas Instruments Incorporated Submit Document Feedback 59 Product Folder Links: LP8866S-Q1 |
Similar Part No. - LP8866S-Q1_V01 |
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Similar Description - LP8866S-Q1_V01 |
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